Experimental charmonium decay results from BES

TL;DR

This paper reports on measurements of various charmonium decay modes using large datasets from BESII, providing valuable data to improve understanding of Quantum Chromodynamics (QCD).

Contribution

It presents new experimental measurements of branching fractions for multiple charmonium decay channels, enhancing existing data on QCD-related processes.

Findings

Branching fractions for psi(2S) to tau+ tau- are measured.

Multi-body decay modes of psi(2S) are quantified.

J/psi hadronic decay branching ratios are reported.

Abstract

Based on 14 million psi(2S) and 58 million J/psi events collected by the BESII detector, the leptonic decay of psi(2S) into $\tau^+\tau^-$, psi(2S) multi-body decays, chi_cJ decays, and J/psi hadronic decays are studied, and the branching fractions of these decays are reported. These results may shed light on the understanding of QCD.